Respuesta :

Step-by-step explanation:

(a-4) (a-5) = a^2 - 9a + 20

(a-10) (a-2) = a^2 - 12a + 20

(a-4) (a+5) = a^2 +a - 20

(a-10) (a+2) = a^2 -8a - 20

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